gcylc dot-view: collapse and expand individual namespaces

[oliver-sanders]

Closes #132
Families can now be expanded/collapsed in the dot view.

@hjoliver Please Review
@benfitzpatrick Please Review

[hjoliver]

I've been playing with this with the examples/task-states suite, which has one family. I'm getting quite frequent exceptions like this:

/home/vagrant/cylc/cylc.git/lib/cylc/gui/updater_dot.py:296: Warning: Source ID 5244 was not found when attempting to remove it
  self.led_liststore.clear()

Also, family-expand sometimes has no effect, and sometimes it quickly collapses again by itself. @oliver-sanders - do you see these problems?

[oliver-sanders]

@hjoliver Fixed:

• Issue where rows collapse on state change
• Issue where clicking on families in transpose mode has no effect

I was unable to replicate your warning message, please say if it persists.

[hjoliver]

(as discussed) warning messages still emitted, only for the non-transposed view.

[oliver-sanders]

@hjoliver e381dc2 should suppress these warnings.

[hjoliver]

This isn't working - second arg should match the warning message?

[oliver-sanders]

Derp, have updated the string accordingly.

[benfitzpatrick]

For consistency with the rest of the code, it's better to use brackets for continuation lines

[benfitzpatrick]

Can we flip the triangle so it points towards the name in non-expanded mode? I think that is the right direction (with my head on its side).

[oliver-sanders]

@benfitzpatrick Addressed comments.

[hjoliver]

If I start up in the transposed state, the family won't expand.

[oliver-sanders]

@hjoliver, @benfitzpatrick

• Fixed the startup in transpose state bug.
• c8b7fdc Fixes a bug whereby the transpose view icon in the view's toolbar is not set with the correct state when setting transpose <dot/graph> = True in the gcylc.rc file.

[hjoliver]

That's got it, thanks. Ben agrees on merge.